Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 types of flowering plants local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest varieties diversity is within eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters large, however, many are small trees, as well as others lianas reaching up to 30 m (98 foot) by climbing up trees. They could be either evergreen or deciduous, although cultivated temperate kinds are deciduous generally.Having been introduced to the Azores, H. macrophylla is now very common, on Faial particularly, which is recognized as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea bouquets are produced from planting season to late fall months; they increase in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of flowers: small non-showy flowers in the guts or interior of the flowerhead, and large, showy plants with large vibrant sepals (tepals). These showy flowers are often lengthened in a engagement ring, or to the surface of the small flowers. Vegetation in untamed populations routinely have few to nothing of the showy blossoms, while cultivated hydrangeas have been bred and selected to have more of the larger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large round flowerheads resembling pom-poms or, as the name signifies, the head of the mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers surrounded by outer wedding rings of larger plants having showy tepals or sepals.
The blooms of some viburnums and rhododendrons can look, initially, a lot like those of some hydrangeas.Ground and colors acidityIn most varieties the blooms are white, but in some types (notably H. macrophylla), can be blue, red, pink, light crimson, or dark crimson. In these kinds the color is influenced by the existence of metal ions which can be found or tangled up depending upon the ground pH. For H. h and macrophylla. serrata cultivars, the flower color can be determined by the relative acidity of the soil: an acidic soil (pH below 7), will supply aluminum ions and produce flowers that are blue to purple typically, whereas an alkaline soil (pH above 7) will tie up aluminum ions and result in pink or red flowers.
This is the effect of a color change of the flower pigments in the existence of aluminium ions which may be taken up into hyperaccumulating vegetation.[6] Reducing the pH of potting soils or mixes usually will not change the bloom color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is also influenced by the cultivar. Some plants are selected because of their ability to be blued, while some are bred and selected to be red, pink or white. The flower color of most other Hydrangea species is not damaged by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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